Air Conditioning Repair Cost UK 2026
Most home air conditioning repairs cost between £100 and £800 in the UK in 2026, on top of an £80–£150 diagnostic call-out. Small jobs such as a re-gas or a new sensor sit at the lower end, while a fan motor or refrigerant-leak repair costs more, and a failed compressor (£600–£1,500+) often tips the decision toward replacement. This guide breaks the price down fault by fault and shows when it is worth repairing rather than replacing.
How much does air conditioning repair cost?
In 2026, expect an £80–£150 call-out to diagnose the fault, then £100–£800 for most common home repairs. A re-gas after a leak is fixed runs £100–£300, a fan motor £250–£600, and leak detection and repair £200–£600 or more. A compressor replacement is the big one at £600–£1,500+, at which point a new system often makes more sense. Any work involving refrigerant must be done by an F-Gas certified engineer — this is a legal requirement, and it is illegal to simply vent refrigerant to the air. The cheapest way to control repair cost is to fix faults early and compare quotes on the same diagnosis.
| Repair | Typical symptom | Indicative cost (2026) |
|---|---|---|
| Diagnostic call-out | Unit dead, tripping or throwing an error code | £80–£150 |
| Re-gas / recharge (after leak fixed) | Weak cooling, ice on pipework | £100–£300 |
| Capacitor, sensor or control PCB | Won't start, intermittent, error code | £120–£350 |
| Condensate pump / drainage | Water dripping from the indoor unit | £120–£300 |
| Fan motor (indoor or outdoor) | Noisy, not spinning, weak airflow | £250–£600 |
| Refrigerant leak detection & repair | Gradual loss of cooling, gas loss | £200–£600+ |
| Compressor replacement | No cooling at all, repeated tripping | £600–£1,500+ |
Indicative supplied-and-fitted prices including VAT for domestic and light-commercial split systems, based on UK engineer quote data gathered in 2026. Excludes parts still under manufacturer warranty. Car air conditioning is priced separately. Always compare at least two or three quotes on the same diagnosis.
Repair cost by fault
The part that has failed is the biggest single driver of the bill. The chart shows typical installed repair ranges for the faults engineers see most often on UK home and small-office split systems — the call-out is usually rolled into the repair if you go ahead.
| Fault | What is happening | Typical fix | Indicative cost |
|---|---|---|---|
| Not cooling, low on gas | Refrigerant has leaked out | Find and repair leak, then re-gas | £200–£600+ |
| Won't power on / trips | Failed capacitor, sensor or PCB | Replace the faulty component | £120–£350 |
| Weak or no airflow | Fan motor or bearing failure | Replace fan motor | £250–£600 |
| Water leaking indoors | Blocked drain or failed pump | Clear drain / replace pump | £120–£300 |
| No cooling, compressor dead | Compressor has failed | Replace compressor (or system) | £600–£1,500+ |
A thorough engineer will pressure-test for leaks and hold a vacuum before recharging — if the system won't hold a vacuum, the leak must be fixed first. For routine upkeep that heads off many of these faults, see our air con servicing cost guide. For help with specific symptoms, see our pages on air conditioning not cooling and water leaking from the indoor unit.
Should you repair or replace?
A repair is usually the right call for a young, well-maintained unit with a single failed part. Replacement starts to win once the unit is older, the fault is expensive, or the refrigerant is obsolete.
A useful rule of thumb: if a repair costs more than about half the price of a new system, or the unit is more than 10–12 years old, replacing it is often better value — a new single split runs £1,500–£3,000 supplied and installed, brings a fresh warranty and cuts running costs through better efficiency. The clearest replace signal is refrigerant type. Older systems charged with R22 cannot legally be topped up, because R22 has been banned for servicing use in the UK since 2015; a leaking R22 unit effectively has to be replaced rather than re-gassed. Repeated faults on the same unit, a failed compressor, or a system that is noisy and struggling also point toward replacement. Most systems installed in the UK today are charged with R32, a lower global-warming refrigerant that is now the standard; the older R410A blend is being phased down under the F-Gas rules, so its price has risen and a large R410A recharge can be surprisingly expensive — another point in favour of replacing an ageing, leak-prone unit. If you are weighing it up, our repair-or-replace comparison walks through the decision, and where a fault is a lost charge our recharge cost guide explains why the leak is fixed first.
| Lean toward repair when… | Lean toward replace when… |
|---|---|
| Unit is under ~8–10 years old | Unit is 10–12+ years old |
| One clear, affordable failed part | Compressor failure or repeated faults |
| Repair is well under half a new unit | Repair is more than ~50% of a new unit |
| Modern R32 or R410A refrigerant | Obsolete R22 refrigerant (can't be re-gassed) |
| Still cools and heats well otherwise | Noisy, weak and expensive to run |
If replacement is the better option, our installation hub covers new-system costs, and the brands hub compares the main manufacturers.
What moves your repair price
Two call-outs for the same symptom can be quoted differently. These are the factors that matter most on an air conditioning repair.
- Which part has failed — a sensor or capacitor is a low-cost swap; a fan motor, leak repair or compressor is far more labour and material.
- Diagnosis time — an intermittent fault or a hidden refrigerant leak can take longer to trace, and the call-out reflects that.
- Parts availability and warranty — genuine parts for premium brands cost more, but a unit still under manufacturer warranty may have the part covered, leaving only labour.
- Refrigerant type and amount — recharging depends on how much gas the system holds and which refrigerant it uses; obsolete R22 can't be topped up at all.
- Access and location — a high-level outdoor unit, a long pipe run or a tricky roof position adds time. London and the South East, including Surrey, tend to sit toward the top of each range.
- Whether it's a single fault or the unit is failing — several worn parts at once shifts the sensible spend from repair to replacement.
How to keep repair bills low
Most expensive breakdowns build up quietly — a small leak or a clogged filter that strains the system for months. A little routine care avoids the big bills.
An annual service — typically £75–£150 per unit — cleans filters and coils, checks refrigerant pressures and catches small leaks before they starve the compressor, which is the single most expensive part to replace. Keeping filters clean yourself between services protects airflow and efficiency, and acting on early warning signs (weaker cooling, new noises, water where there shouldn't be) usually means a cheap fix rather than a major one. A well-maintained system also runs more cheaply day to day — at the July–September 2026 Ofgem price cap of 26.11p per kWh (a £1,663-a-year cap for a typical home), an efficient, clean unit costs noticeably less to run than one choked with dust — see our running costs guide — and for a full maintenance breakdown, visit our servicing hub.
Frequently asked questions
Sources & methodology
- Repair and call-out ranges compiled from UK air conditioning engineer quote data gathered during 2026 for domestic and light-commercial split systems.
- Refrigerant regulations reflect the F-Gas rules requiring certified handling, and the ban on using R22 for servicing in the UK since 2015.
- Replacement reference prices from typical UK single-split installation costs; running-cost context from the Ofgem energy price cap.
- Prices are indicative and include VAT — they are not quotations. Your cost depends on an on-site diagnosis. Car air conditioning is not covered here.
Get accurate repair prices
Air Con Surrey is a free matching service. Tell us the make of unit and the symptom and we'll match you with vetted, F-Gas certified air conditioning engineers who diagnose the fault and quote for exactly your repair — so you compare real prices, not estimates.